OB35延时中断是指每隔100MS调用OB35组织块，而CP340的P_SEND这个位必须满足上升沿与OB35没有关系。所以无论在OB35里还是在一般FC中要想用CP340的发送功能，必须满足P_SEND为上升沿。下面是个例子 你参考一下
A "PA100-FStemp"
NOT
= "PA100-FStemp" //保证PA100-FStemp每2个扫描周期就有个上升沿
CALL "P_SEND" , DB3
REQ :="PA100-FStemp"
R :=FALSE
LADDR :=256
DB_NO :=140
DBB_NO:=0
LEN :="PA100-FSLen"
DONE :="PA100-FSCG"
ERROR :="PA100-FSError"
STATUS:="PA100-FSStatus"